#include "cryptlib.h"
#include <openssl/evp.h>
#include <openssl/err.h>
+#include "evp_locl.h"
+
+#include <assert.h>
const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT;
int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
unsigned char *key, unsigned char *iv, int enc)
{
- if(enc) enc = 1;
- if (cipher) {
+ if(enc && (enc != -1)) enc = 1;
+ if (cipher)
+ {
+ if(ctx->cipher)
+ EVP_CIPHER_CTX_cleanup(ctx);
ctx->cipher=cipher;
+ ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size);
ctx->key_len = cipher->key_len;
+ ctx->flags = 0;
+ if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
+ if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
+ EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ }
} else if(!ctx->cipher) {
EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET);
return 0;
}
+
+ /* we assume block size is a power of 2 in *cryptUpdate */
+ assert(ctx->cipher->block_size == 1
+ || ctx->cipher->block_size == 8
+ || ctx->cipher->block_size == 16);
+
if(!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) {
switch(EVP_CIPHER_CTX_mode(ctx)) {
if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
if(!ctx->cipher->init(ctx,key,iv,enc)) return 0;
}
- ctx->encrypt=enc;
+ if(enc != -1) ctx->encrypt=enc;
ctx->buf_len=0;
+ ctx->final_used=0;
+ ctx->block_mask=ctx->cipher->block_size-1;
return 1;
}
return EVP_CipherInit(ctx, cipher, key, iv, 0);
}
-
int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
unsigned char *in, int inl)
{
int i,j,bl;
+ if(ctx->buf_len == 0 && (inl&(ctx->block_mask)) == 0)
+ {
+ if(ctx->cipher->do_cipher(ctx,out,in,inl))
+ {
+ *outl=inl;
+ return 1;
+ }
+ else
+ {
+ *outl=0;
+ return 0;
+ }
+ }
i=ctx->buf_len;
bl=ctx->cipher->block_size;
- *outl=0;
- if ((inl == 0) && (i != bl)) return 1;
if (i != 0)
{
if (i+inl < bl)
{
memcpy(&(ctx->buf[i]),in,inl);
ctx->buf_len+=inl;
+ *outl=0;
return 1;
}
else
{
j=bl-i;
- if (j != 0) memcpy(&(ctx->buf[i]),in,j);
+ memcpy(&(ctx->buf[i]),in,j);
if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0;
inl-=j;
in+=j;
out+=bl;
- *outl+=bl;
+ *outl=bl;
}
}
- i=inl%bl; /* how much is left */
+ else
+ *outl = 0;
+ i=inl&(bl-1);
inl-=i;
if (inl > 0)
{
return 1;
}
bl=ctx->buf_len;
+ if (ctx->flags & EVP_CIPH_NO_PADDING)
+ {
+ if(bl)
+ {
+ EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
+ return 0;
+ }
+ *outl = 0;
+ return 1;
+ }
n=b-bl;
for (i=bl; i<b; i++)
ctx->buf[i]=n;
int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
unsigned char *in, int inl)
{
- int b,bl,n;
- int keep_last=0;
+ int b;
- *outl=0;
- if (inl == 0) return 1;
+ if (inl == 0)
+ {
+ *outl=0;
+ return 1;
+ }
+
+ if (ctx->flags & EVP_CIPH_NO_PADDING)
+ return EVP_EncryptUpdate(ctx, out, outl, in, inl);
b=ctx->cipher->block_size;
- if (b > 1)
+ if(ctx->final_used)
{
- /* Is the input a multiple of the block size? */
- bl=ctx->buf_len;
- n=inl+bl;
- if (n%b == 0)
- {
- if (inl < b) /* must be 'just one' buff */
- {
- memcpy(&(ctx->buf[bl]),in,inl);
- ctx->buf_len=b;
- *outl=0;
- return 1;
- }
- keep_last=1;
- inl-=b; /* don't do the last block */
- }
+ memcpy(out,ctx->final,b);
+ out+=b;
}
- if(!EVP_EncryptUpdate(ctx,out,outl,in,inl)) return 0;
+
+ if(!EVP_EncryptUpdate(ctx,out,outl,in,inl))
+ return 0;
/* if we have 'decrypted' a multiple of block size, make sure
* we have a copy of this last block */
- if (keep_last)
+ if (b > 1 && !ctx->buf_len)
{
- memcpy(&(ctx->buf[0]),&(in[inl]),b);
-#ifdef DEBUG
- if (ctx->buf_len != 0)
+ if(!ctx->final_used)
{
- abort();
+ *outl-=b;
+ ctx->final_used=1;
}
-#endif
- ctx->buf_len=b;
+ memcpy(ctx->final,&out[*outl],b);
+ }
+ else if(ctx->final_used)
+ {
+ ctx->final_used=0;
+ *outl+=b;
}
return 1;
}
*outl=0;
b=ctx->cipher->block_size;
+ if (ctx->flags & EVP_CIPH_NO_PADDING)
+ {
+ if(ctx->buf_len)
+ {
+ EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
+ return 0;
+ }
+ *outl = 0;
+ return 1;
+ }
if (b > 1)
{
- if (ctx->buf_len != b)
+ if (ctx->buf_len || !ctx->final_used)
{
EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_WRONG_FINAL_BLOCK_LENGTH);
return(0);
}
- if(!EVP_EncryptUpdate(ctx,ctx->buf,&n,ctx->buf,0)) return 0;
- if (n != b)
- return(0);
- n=ctx->buf[b-1];
+ n=ctx->final[b-1];
if (n > b)
{
EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
}
for (i=0; i<n; i++)
{
- if (ctx->buf[--b] != n)
+ if (ctx->final[--b] != n)
{
EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT);
return(0);
}
n=ctx->cipher->block_size-n;
for (i=0; i<n; i++)
- out[i]=ctx->buf[i];
+ out[i]=ctx->final[i];
*outl=n;
}
else
{
if(!c->cipher->cleanup(c)) return 0;
}
+ OPENSSL_free(c->cipher_data);
memset(c,0,sizeof(EVP_CIPHER_CTX));
return 1;
}
int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
{
+ if(c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
+ return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
if(c->key_len == keylen) return 1;
if((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH))
{
return 0;
}
+int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
+ {
+ if (pad) ctx->flags &= ~EVP_CIPH_NO_PADDING;
+ else ctx->flags |= EVP_CIPH_NO_PADDING;
+ return 1;
+ }
+
+int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
+{
+ int ret;
+ if(!ctx->cipher) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
+ return 0;
+ }
+
+ if(!ctx->cipher->ctrl) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
+ return 0;
+ }
+
+ ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
+ if(ret == -1) {
+ EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
+ return 0;
+ }
+ return ret;
+}
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